Best Time to Visit: Winters, especially after rains when hills are green. In March—April timeframe, wildflowers are in full bloom.

Permit: The "Ohlone Wilderness Regional Trail Hiking Permit/Map" is required for day use and camping. It is available for $2 per person per year at the Sunol and Del Valle entrance kiosks (don't forget to check when the kiosks open). You may purchase the permit online.

Hikes: The 28-mile Ohlone Wilderness Trail has two sections. The first section is 20 miles long: from Del Valle Regional Park to Sunol Wilderness Preserve. The second section is 8 miles long: from Sunol Wilderness Preserve to Mission Peak Regional Preserve. In the middle of the first section lies 3,817-foot Rose Peak, just 32 feet lower than Mount Diablo. So there are two different out-and-back 20-mile day hikes to Rose Peak, one starts at Del Valle, the other starts at Sunol. The trail is well-maintained and well-marked by frequent signposts.

Ohlone 50K: In May, the annual Ohlone 50K ultra-marathon is organized. Most of the route is along the Ohlone trail — some other trails have been added to make it 31 miles (50 kilometers) long. Check out route information and elevation profile for more details!